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For reading comprehension, students receive a grade based on a markscheme (answer key) for questions that are multiple-choice, short-answer, true/false/justify, matching and extended response. [5] Availability. Spanish ab initio, Mandarin ab initio and French ab initio are offered online to students enrolled in the IB Diploma Programme. [6] [7]
In chemistry, a reaction intermediate, or intermediate, is a molecular entity arising within the sequence of a stepwise chemical reaction. It is formed as the reaction product of an elementary step, from the reactants and/or preceding intermediates, but is consumed in a later step. It does not appear in the chemical equation for the overall ...
In chemistry, an interhalogen compound is a molecule which contains two or more different halogen atoms (fluorine, chlorine, bromine, iodine, or astatine) and no atoms of elements from any other group. Most interhalogen compounds known are binary (composed of only two distinct elements).
In coordination chemistry, a ligand [a] is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs , often through Lewis bases . [ 1 ]
The carbylamine reaction (also known as the Hoffmann isocyanide synthesis) is the synthesis of an isocyanide by the reaction of a primary amine, chloroform, and base.The conversion involves the intermediacy of dichlorocarbene.
The IB is a nonprofit organization, [22] selling its products and services to schools in a system analogous to a franchise network. Schools buy products and services from the IB – assessments, publications, the right to use branding – and in turn schools act as distributors, reselling the products and services to families. [23]
Elias James Corey (born July 12, 1928) is an American organic chemist.In 1990, he won the Nobel Prize in Chemistry "for his development of the theory and methodology of organic synthesis", [3] specifically retrosynthetic analysis.
Fluorescence microscopy relies upon fluorescent compounds, or fluorophores, in order to image biological systems.Since fluorescence and phosphorescence are competitive methods of relaxation, a fluorophore that undergoes intersystem crossing to the triplet excited state no longer fluoresces and instead remains in the triplet excited state, which has a relatively long lifetime, before ...